Gas Pipe Sizing Chart
Natural Gas (NG)
| Pipe Length (ft.) | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" | 2-1/2" | 3" | 4" |
|---|---|---|---|---|---|---|---|---|---|
| 10 | 108 | 203 | 387 | 793 | 1237 | 2259 | 3640 | 6434 | 9621 |
| 20 | 75 | 160 | 280 | 569 | 877 | 1610 | 2813 | 5226 | 9261 |
| 30 | 62 | 126 | 220 | 479 | 719 | 1335 | 2165 | 4107 | 7899 |
| 40 | 52 | 110 | 196 | 401 | 636 | 1143 | 1867 | 3508 | 6795 |
| 50 | 42 | 92 | 163 | 336 | 518 | 957 | 1559 | 2894 | 5647 |
| 60 | 38 | 83 | 143 | 279 | 443 | 896 | 1447 | 2492 | 5250 |
| 70 | 36 | 76 | 140 | 239 | 423 | 840 | 1353 | 2315 | 4900 |
| 80 | 34 | 68 | 125 | 225 | 420 | 793 | 1288 | 2203 | 4687 |
| 90 | 32 | 62 | 114 | 210 | 369 | 775 | 1246 | 2128 | 4518 |
| 100 | 30 | 60 | 110 | 202 | 364 | 759 | 1196 | 2095 | 4465 |
| 150 | 25 | 47 | 93 | 195 | 303 | 685 | 993 | 1564 | 3370 |
| 200 | 22 | 43 | 81 | 159 | 254 | 541 | 877 | 1437 | 3160 |
| 300 | 17 | 30 | 70 | 145 | 224 | 439 | 688 | 1139 | 2539 |
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Notes:
- Natural Gas (NG) flow is given in thousands of BTU/hr.
- Nominal pressure at the burner for Natural Gas is 3.5” of water column (7” typical machine supply).
- Pipe lengths must include additional length for all fittings (add approximately 5 feet of pipe per fitting).
Liquid Propane (LP)
| Pipe Length (ft.) | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" | 2-1/2" | 3" | 4" |
|---|---|---|---|---|---|---|---|---|---|
| 10 | 275 | 567 | 1071 | 2205 | 3307 | 6221 | 10140 | 17990 | 35710 |
| 20 | 190 | 393 | 732 | 1496 | 2249 | 4305 | 7046 | 12610 | 25520 |
| 30 | 152 | 315 | 590 | 1222 | 1868 | 3455 | 5969 | 10422 | 21559 |
| 40 | 125 | 263 | 490 | 1015 | 1559 | 3037 | 5225 | 8935 | 17456 |
| 50 | 109 | 223 | 430 | 885 | 1352 | 2650 | 4574 | 7855 | 15710 |
| 60 | 98 | 198 | 374 | 804 | 1229 | 2431 | 4207 | 7299 | 14492 |
| 70 | 89 | 174 | 330 | 726 | 1145 | 2174 | 3876 | 6865 | 13256 |
| 80 | 79 | 163 | 303 | 648 | 1036 | 2035 | 3563 | 6321 | 12652 |
| 90 | 73 | 152 | 285 | 610 | 972 | 1865 | 3329 | 5929 | 11816 |
| 100 | 68 | 143 | 268 | 589 | 940 | 1765 | 3141 | 5505 | 11367 |
| 150 | 54 | 108 | 203 | 445 | 693 | 1416 | 2505 | 4275 | 9058 |
| 200 | 43 | 93 | 166 | 335 | 543 | 1152 | 2051 | 3540 | 7202 |
| 300 | 37 | 74 | 144 | 303 | 468 | 947 | 1505 | 2691 | 5084 |
-
Notes:
- Liquid Propane (LP) flow is given in thousands of BTU/hr.
- Nominal pressure at the burner for LP gas is 11” of water column.
Additional Information
- For high elevation installations (above 4500 ft.), adjustments may be necessary for gas piping, orifice sizes, and equipment performance.
- Consult with a Licensed Plumber/Gas Fitter for detailed recommendations.